ASP.Net MVC模型绑定我做错了什么

本文关键字：错了 什么 绑定 Net MVC 模型 ASP | 更新日期: 2023-09-27 17:49:14

当我试图访问发布的模型时，我得到了一个NullReference。我做错了什么?我已经试过了我能想到的所有方法，但我一定是错过了什么简单的东西?以下是我的相关代码:

控制器

    public ActionResult EditQuestion(int id)
    {
        IFeedbackRepository rep = DAL.RepositoryFactory.GetFeedbackRepository();
        var q = rep.GetQuestion(id);
        SurveyQuestionEditModel question = new SurveyQuestionEditModel()
        {
            Id=q.Id,
            IsFreeText=q.FreeTextResponse,
            SurveyId=q.SurveyId,
            Question=q.Question,
            Category=q.Category
        };
        return View(question);
    }
    [HttpPost]
    public ActionResult EditQuestion(SurveyQuestionEditModel question)
    {
        IFeedbackRepository rep = DAL.RepositoryFactory.GetFeedbackRepository();
        rep.UpdateSurveyQuestion(question.Id, question.Question, question.IsFreeText, question.Category);
        return RedirectToAction("Edit", new { id = question.SurveyId });
    }

ASPX的相关部分:

    <fieldset>            
            <%: Html.HiddenFor(model => model.Id) %>
            <%: Html.HiddenFor(model => model.SurveyId) %>
        <div class="editor-label">
            <%: Html.LabelFor(model => model.Question) %>
        </div>
        <div class="editor-field">
            <%: Html.TextBoxFor(model => model.Question) %>
创建

: 

   <form action="/feedback/Survey/EditQuestion" method="post">
    <fieldset>
        <legend></legend>
            <input id="Id" name="Id" type="hidden" value="72" />
            <input id="SurveyId" name="SurveyId" type="hidden" value="4" />
        <div class="editor-label">
            <label for="Question">Question</label>
        </div>
        <div class="editor-field">
            <input id="Question" name="Question" type="text" value="Test" />
        </div>
        <div class="editor-label">
            <label for="Category">Question Category</label>
        </div>
        <div class="editor-field">
            <input id="Category" name="Category" type="text" value="Test" />
        </div>
        <div class="editor-label">
            <label for="IsFreeText">Does this question require a free text response?</label>
        </div>
        <div class="editor-field">
            <input checked="checked" id="IsFreeText" name="IsFreeText" type="checkbox" value="true" /><input name="IsFreeText" type="hidden" value="false" />
        </div>
        <p>
            <input type="submit" value="Save" />
        </p>
    </fieldset>
</form>

下面是模型类:

    public class SurveyQuestionEditModel
    {

        public int Id { get; set; }
        [DisplayName("Question")]
        [Required]
        [MinLength(4)]
        public string Question { get; set; }
        [DisplayName("Does this question require a free text response?")]
        public bool IsFreeText { get; set; }
        public int SurveyId { get; set; }
        [DisplayName("Question Category")]
        [Required]
        public string Category { get; set; }
    }

ASP.Net MVC模型绑定我做错了什么

看起来像这样的问题:当表单提交时，模型是null

替换你的参数名:

public ActionResult EditQuestion(SurveyQuestionEditModel question)
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